CN101399022A - Grid drive deivce and method - Google Patents
Grid drive deivce and method Download PDFInfo
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- CN101399022A CN101399022A CNA2007101754877A CN200710175487A CN101399022A CN 101399022 A CN101399022 A CN 101399022A CN A2007101754877 A CNA2007101754877 A CN A2007101754877A CN 200710175487 A CN200710175487 A CN 200710175487A CN 101399022 A CN101399022 A CN 101399022A
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Abstract
The invention discloses a grid driving device and a method thereof. The grid driving device comprises: a grid shutting power input end, a grid starting power input end and a grid driving integrated circuit. The grid shutting power input end is connected with the grid driving integrated circuit which is connected with the grid starting power input end; a current impulse generating unit is arranged inside of the grid driving integrated circuit. The method comprises the following steps: when applying grid starting voltage and grid shutting voltage, a current impulse is applied to the grid starting voltage and the grid shutting voltage, thus leading the current of the grid starting voltage to be increased and the current of the grid shutting voltage to be decreased. In the invention, a current impulse is increased on the grid starting voltage and the grid shutting voltage by the current impulse generating unit, so as to further increase momentary driving capability, reduce grid line delay and improve the image quality.
Description
Technical field
The present invention relates to a kind of gate drive apparatus and method, belong to the Driving technique field of Thin Film Transistor-LCD.
Background technology
In Thin Film Transistor-LCD (TFT LCD) driving circuit, DC-to-dc voltage changer (DC/DC) uses charge pump circuit or width modulation (PWM) circuit to produce grid trigger voltage Von and gate off voltage Voff.Because the resistance in thin film transistor (TFT) (TFT) the matrix driving circuit and the reason of electric capacity, grid trigger voltage Von and gate off voltage Voff delay phenomenon can appear, make the waveform distortion of gate drive voltage, thereby cause the moment driving force deficiency of grid trigger voltage Von and gate off voltage Voff, as shown in Figure 5.Studies show that gate drive voltage postpones to influence the resolution that shows, further picture quality is had adverse effect.
Summary of the invention
The purpose of this invention is to provide a kind of gate drive apparatus and method, by on gate driver circuit, increasing current impulse, and then increase the moment driving force, effectively reduce gate drive voltage and postpone.
To achieve these goals, first aspect present invention provides a kind of gate drive apparatus, comprises that grid starts power input, is used for to grid-driving integrated circuit output grid trigger voltage; The gate turn-off power input is used for to grid-driving integrated circuit output gate off voltage; The current impulse generation unit, being connected described grid starts between power input and the gate turn-off power input, be arranged in the described grid-driving integrated circuit, be used for when grid starts power input output grid trigger voltage the output current pulse to improve the electric current of grid trigger voltage, or when gate turn-off power input output gate off voltage the output current pulse to reduce the electric current of gate off voltage, to reduce the delay of gate drive voltage.
Described switch element comprises first single-pole double-throw switch (SPDT), and its public connecting end connects described inductance, and first stationary contact connects input supply terminal, and second stationary contact connects the positive pole of the described second unidirectional conducting diode; Second single-pole double-throw switch (SPDT), its public connecting end connects the negative pole of the described first unidirectional conducting diode, the first stationary contact ground connection, second stationary contact connects the negative pole of described the 3rd unidirectional conducting diode.
On the technique scheme basis, described input supply terminal is the power supply end of external circuit pcb board, and magnitude of voltage is 5V or 3.3V.
To achieve these goals, second aspect present invention provides a kind of grid drive method, comprising:
Step 1: in the setting-up time before output grid trigger voltage or gate off voltage, the current impulse generation unit is charged;
Step 2: when output grid trigger voltage or gate off voltage, described current impulse generation unit discharge, the output current pulse is with electric current that improves the grid trigger voltage or the electric current that reduces gate off voltage, to reduce the delay of gate drive voltage.
Wherein, described setting-up time is 3 μ s-5 μ s.
The driving force deficiency that the present invention is directed to the delay of grid trigger voltage and gate off voltage and cause, proposed a kind of reasonable in design, effectively solve and less gate drive apparatus and the method for cost, by on grid trigger voltage and gate off voltage, increasing a current impulse, the electric current of grid trigger voltage is raise, the electric current of gate off voltage is reduced, thereby increase the driving force of gate drive voltage, reduce the delay of gate drive voltage, further improve picture quality.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the structural representation of gate drive apparatus of the present invention;
Fig. 2 is the circuit diagram of gate drive apparatus one embodiment of the present invention;
Fig. 3 is the circuit diagram of another embodiment of gate drive apparatus of the present invention;
Fig. 4 is the gate drive voltage oscillogram of reality of the present invention;
Fig. 5 is a gate drive voltage oscillogram actual in the prior art.
Description of reference numerals:
Voff-gate turn-off power input; D1-unidirectional conducting diode;
Von-grid starts power input; D2-unidirectional conducting diode;
T/CON-time schedule controller; D3-unidirectional conducting diode;
L-inductance; Vdd-input supply terminal;
S1-first single-pole double-throw switch (SPDT); S2-second single-pole double-throw switch (SPDT);
A-first single-pole double-throw switch (SPDT) stationary contact; B-first single-pole double-throw switch (SPDT) stationary contact;
C-second single-pole double-throw switch (SPDT) stationary contact; D-second single-pole double-throw switch (SPDT) stationary contact.
Embodiment
Fig. 1 is the structural representation of gate drive apparatus of the present invention.As shown in Figure 1, this device comprises that grid starts power input Von, gate turn-off power input Voff, current impulse productive unit and grid-driving integrated circuit (Gate Drive IC is called for short GDIC).Gate turn-off power input Voff connects grid-driving integrated circuit, grid-driving integrated circuit connects grid and starts power input Von, the current impulse generation unit is connected grid and starts between power input Von and the gate turn-off power input Voff, and be arranged at grid-driving integrated circuit inside, be used for when grid starts power input Von output grid trigger voltage the output current pulse to improve the electric current of grid trigger voltage, or when gate turn-off power input Voff output gate off voltage the output current pulse to reduce the electric current of gate off voltage, to reduce the delay of gate drive voltage.
The present invention generates a current impulse by the current impulse generation unit, and the electric current of grid trigger voltage is raise, and the electric current of gate off voltage is reduced, thereby can shorten the charging and the discharge time of grid, reduces the delay of gate drive voltage.
Fig. 2 is the circuit diagram of gate drive apparatus one embodiment of the present invention.As shown in Figure 2, the current impulse generation unit comprises input supply terminal Vdd, switch element, inductance L, the first unidirectional conducting diode D1, the second unidirectional conducting diode D2, the 3rd unidirectional conducting diode D3, also comprises time schedule controller T/CON among the figure.Wherein, first end 1 of switch element is connected with input supply terminal Vdd, and the 4th end 4 receives first control signal and second control signal that time schedule controller T/CON sends, switch element the 7th end 7 ground connection.One end of inductance L is connected with second end 2 of switch element; The positive pole of the first unidirectional conducting diode D1 is connected with the other end of inductance L, and negative pole is connected with the 3rd end 3 of switch element; The positive pole of the second unidirectional conducting diode D2 is connected with the 6th end 6 of switch element, and negative pole is connected with gate turn-off power input Voff; The positive pole of the 3rd unidirectional conducting diode D3 is connected with grid power-on input end Von, and negative pole is connected with the five terminal 5 of switch element.
Be in first working method after first control signal that switch element reception time schedule controller T/CON sends, input supply terminal Vdd charges to inductance L by first circuit loop that first end 1, second end 2 of switch element, inductance L, the first unidirectional conducting diode D1, the 3rd end 3, switch element the 7th end 7 and the earth terminal of switch element by switch element constitute; Switch element is in second working method after receiving second control signal that time schedule controller T/CON sends, and inductance L is discharged by the second circuit loop that the 6th end 6 by five terminal 5, grid-driving integrated circuit and the switch element of the 3rd end 3 of the first unidirectional conducting diode D1, switch element, switch element constitutes.
The course of work of gate drive apparatus of the present invention is divided into two stages: inductance L charging stage and inductance L discharge regime.Its principle of work is: in the time of one section setting before applying grid trigger voltage or gate off voltage, time schedule controller T/CON sends the control signal control switch unit and is in first working method, at this moment, power supply Vdd from circuit board provides 5V or 3.3V voltage, by first circuit loop inductance L is charged, the electric current that flows through inductance L increases.The time of setting is 3 μ s-5 μ s, can be by the parameter decision of inductance.
In the moment that applies grid trigger voltage or gate off voltage, time schedule controller T/CON sends the control signal control switch unit and is in second kind of working method, inductance L is by the discharge of second circuit loop, in the discharge process, the grid trigger voltage reduces to the electric current that electric current raises or gate off voltage is exported to grid-driving integrated circuit of grid-driving integrated circuit output, the electric current of this rising or reduction is held time shorter, be current impulse, this current impulse can be shortened the charging and the discharge time of grid, reduces the delay of gate drive voltage.
Fig. 3 is the circuit theory diagrams of another embodiment of gate drive apparatus of the present invention.Present embodiment is on the basis of a last embodiment, duty with the single-pole double-throw switch (SPDT) control circuit, as shown in Figure 3, switch element comprises the first single-pole double-throw switch (SPDT) S1 and the second single-pole double-throw switch (SPDT) S2, the public connecting end of the first single-pole double-throw switch (SPDT) S1 connects inductance L, the first stationary contact a of the first single-pole double-throw switch (SPDT) S1 connects direct supply Vdd, and the second stationary contact b connects the positive pole of the second unidirectional conducting diode D2; The public connecting end of the second single-pole double-throw switch (SPDT) S2 connects the negative pole of the first unidirectional conducting diode D1, the direct ground connection of the first stationary contact c of the second single-pole double-throw switch (SPDT) S2, the second stationary contact d of the second single-pole double-throw switch (SPDT) S2 connects the negative pole of the 3rd unidirectional conducting utmost point pipe D3.
The principle of work of the gate drive apparatus that present embodiment provides is:
The first single-pole double-throw switch (SPDT) S1 and the second single-pole double-throw switch (SPDT) S2 are switching between first stationary contact and second stationary contact under the control of time schedule controller T/CON simultaneously, and Vdd is the direct supply that comes from the external circuit pcb board, and magnitude of voltage is 5V or 3.3V.In the time of one section setting before applying grid trigger voltage and gate off voltage, the first single-pole double-throw switch (SPDT) S1 connects the first stationary contact a, the second single-pole double-throw switch (SPDT) S2 connects the first stationary contact c, direct-current input power supplying Vdd passes through inductance L, first unidirectional conducting diode D1 turning circuit over the ground charges to inductance L, and the electric current that flows through inductance L increases.In the moment that applies grid trigger voltage or gate off voltage, the first single-pole double-throw switch (SPDT) S1 connects the second stationary contact b, the second single-pole double-throw switch (SPDT) S2 connects the second stationary contact d, because inductance L is for the retention performance of electric current, as shown in Figure 3, electric current in the inductance L is downwards by the first unidirectional conducting diode D1 grid-driving integrated circuit of flowing through, after the grid-driving integrated circuit outflow, one road electric current flow to gate turn-off power input Voff by the second unidirectional conducting diode D2, DC-DC voltage changer (DC/DC) circuit flow that passes through again in the film crystal tube drive circuit starts power input Von to grid, is back to grid-driving integrated circuit by the 3rd unidirectional conducting diode D3; The second stationary contact b of another road current direction first single-pole double-throw switch (SPDT) S1 is to inductance L.The electric current rising of grid trigger voltage and the electric current of gate off voltage are reduced, this electric current is the current impulse form, it can shorten the charging and the discharge time of grid, increases the moment driving force of grid trigger voltage and gate off voltage, that is to say and has reduced gate delay.Behind the discharge off, the first single-pole double-throw switch (SPDT) S1 and the second single-pole double-throw switch (SPDT) S2 are in vacant state.
On the technique scheme basis, the invention allows for a kind of grid line driving method, in the moment that applies grid trigger voltage or gate off voltage, increase by a current impulse for grid trigger voltage and gate off voltage, the electric current of grid trigger voltage is raise, the electric current of gate off voltage is reduced, and then increase the moment driving force of grid voltage, reach and reduce the purpose that grid line postpones.As shown in Figure 4,1 ' for not increasing the gate drive voltage waveform of current impulse, 2 ' is the gate drive voltage waveform after the increase current impulse, can learn by comparing 1 ' and 2 ' two waveforms, increase the delay that current impulse can reduce gate drive voltage to gate drive voltage, strengthen its driving force.
Particularly, in the setting-up time before applying grid trigger voltage and gate off voltage to induction charging, wherein setting-up time is 3 μ s-5 μ s, in the moment that applies described grid trigger voltage and gate off voltage, inductive discharge raises the electric current of grid trigger voltage, and the electric current of gate off voltage is reduced, the electric current of this increase can shorten charging, the discharge time of grid, has also promptly reduced the delay of gate drive voltage.
In the grid drive method of the present invention, the device of grid trigger voltage in the film crystal tube drive circuit and gate off voltage increase current impulse is arranged on the inside of grid-driving integrated circuit, not only increase the moment driving force of gate drive voltage, and the delay phenomenon of minimizing gate drive voltage, further improve the high resolving power display effect, improve the quality of picture.
It should be noted that at last: above each embodiment is not intended to limit only in order to technical scheme of the present invention to be described; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. a gate drive apparatus is characterized in that, comprising:
Grid starts power input, is used for to grid-driving integrated circuit output grid trigger voltage;
The gate turn-off power input is used for to grid-driving integrated circuit output gate off voltage;
The current impulse generation unit, being connected described grid starts between power input and the gate turn-off power input, be arranged in the described grid-driving integrated circuit, be used for when grid starts power input output grid trigger voltage the output current pulse to improve the electric current of grid trigger voltage, or when gate turn-off power input output gate off voltage the output current pulse to reduce the electric current of gate off voltage, to reduce the delay of gate drive voltage.
2. gate drive apparatus according to claim 1 is characterized in that, described current impulse generation unit comprises:
Input supply terminal;
Switch element, its first end is connected with described input supply terminal, first control signal and second control signal that the 4th termination time receiving sequence controller sends, the 7th end ground connection;
Inductance, the one end is connected with second end of described switch element;
The first unidirectional conducting diode, its positive pole is connected with the other end of described inductance, and negative pole is connected with the 3rd end of described switch element;
The second unidirectional conducting diode, its positive pole is connected with the 6th end of described switch element, and negative pole is connected with described gate turn-off power input;
The 3rd unidirectional conducting diode, its positive pole is connected with described grid power-on input end, and negative pole is connected with the five terminal of described switch element.
3. gate drive apparatus according to claim 2 is characterized in that, described switch element comprises:
First single-pole double-throw switch (SPDT), its public connecting end connects described inductance, and first stationary contact connects described input supply terminal, and second stationary contact connects the positive pole of the described second unidirectional conducting diode;
Second single-pole double-throw switch (SPDT), its public connecting end connects the negative pole of the described first unidirectional conducting diode, the first stationary contact ground connection, second stationary contact connects the negative pole of described the 3rd unidirectional conducting diode.
4. according to claim 2 or 3 described gate drive apparatus, it is characterized in that described input supply terminal is the power supply end of external circuit pcb board, magnitude of voltage is 5V or 3.3V.
5. a grid drive method is characterized in that, comprising:
Step 1: in the setting-up time before output grid trigger voltage or gate off voltage, the current impulse generation unit is charged;
Step 2: when output grid trigger voltage or gate off voltage, described current impulse generation unit discharge, the output current pulse is with electric current that improves the grid trigger voltage or the electric current that reduces gate off voltage, to reduce the delay of gate drive voltage.
6. grid drive method according to claim 5 is characterized in that, setting-up time described in the step 1 is 3 μ s-5 μ s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101754877A CN101399022B (en) | 2007-09-29 | 2007-09-29 | Grid drive device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101754877A CN101399022B (en) | 2007-09-29 | 2007-09-29 | Grid drive device and method |
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| Publication Number | Publication Date |
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| CN101399022A true CN101399022A (en) | 2009-04-01 |
| CN101399022B CN101399022B (en) | 2010-09-15 |
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| CN2007101754877A Active CN101399022B (en) | 2007-09-29 | 2007-09-29 | Grid drive device and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102708826A (en) * | 2012-06-01 | 2012-10-03 | 福州华映视讯有限公司 | Driving circuit for display panel |
| CN107146592A (en) * | 2017-07-20 | 2017-09-08 | 京东方科技集团股份有限公司 | Driving method, drive circuit and the display device of liquid crystal display panel |
| WO2017197685A1 (en) * | 2016-05-18 | 2017-11-23 | 武汉华星光电技术有限公司 | Goa circuit and liquid crystal display |
| CN110392979A (en) * | 2017-03-02 | 2019-10-29 | 黑拉有限责任两合公司 | Composite switch controller |
| CN111554247A (en) * | 2020-05-22 | 2020-08-18 | Tcl华星光电技术有限公司 | Grid driving chip control circuit and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100796787B1 (en) * | 2001-01-04 | 2008-01-22 | 삼성전자주식회사 | Liquid crystal display system, panel and method for compensating gate line delay |
-
2007
- 2007-09-29 CN CN2007101754877A patent/CN101399022B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102708826A (en) * | 2012-06-01 | 2012-10-03 | 福州华映视讯有限公司 | Driving circuit for display panel |
| WO2017197685A1 (en) * | 2016-05-18 | 2017-11-23 | 武汉华星光电技术有限公司 | Goa circuit and liquid crystal display |
| CN110392979A (en) * | 2017-03-02 | 2019-10-29 | 黑拉有限责任两合公司 | Composite switch controller |
| CN110392979B (en) * | 2017-03-02 | 2023-06-20 | 黑拉有限责任两合公司 | Hybrid switch controller |
| CN107146592A (en) * | 2017-07-20 | 2017-09-08 | 京东方科技集团股份有限公司 | Driving method, drive circuit and the display device of liquid crystal display panel |
| CN111554247A (en) * | 2020-05-22 | 2020-08-18 | Tcl华星光电技术有限公司 | Grid driving chip control circuit and method |
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| Publication number | Publication date |
|---|---|
| CN101399022B (en) | 2010-09-15 |
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Owner name: BEIJING BOE PHOTOELECTRICITY SCIENCE + TECHNOLOGY Effective date: 20141210 Owner name: JINGDONGFANG SCIENCE AND TECHNOLOGY GROUP CO., LTD Free format text: FORMER OWNER: BEIJING BOE PHOTOELECTRICITY SCIENCE + TECHNOLOGY CO., LTD. Effective date: 20141210 |
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Free format text: CORRECT: ADDRESS; FROM: 100176 DAXING, BEIJING TO: 100015 CHAOYANG, BEIJING |
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Effective date of registration: 20141210 Address after: 100015 Jiuxianqiao Road, Beijing, No. 10, No. Patentee after: BOE Technology Group Co., Ltd. Patentee after: Beijing BOE Photoelectricity Science & Technology Co., Ltd. Address before: 100176 Beijing economic and Technological Development Zone, West Central Road, No. 8 Patentee before: Beijing BOE Photoelectricity Science & Technology Co., Ltd. |
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Effective date of registration: 20201203 Address after: 215200 No. 1700, Wujiang economic and Technological Development Zone, Suzhou, Jiangsu, Zhongshan North Road Patentee after: Gaochuang (Suzhou) Electronics Co.,Ltd. Patentee after: BOE TECHNOLOGY GROUP Co.,Ltd. Address before: 100015 Jiuxianqiao Road, Beijing, No. 10, No. Patentee before: BOE TECHNOLOGY GROUP Co.,Ltd. Patentee before: BEIJING BOE OPTOELECTRONICS TECHNOLOGY Co.,Ltd. |